Can you no longer see your note, shared comment, or highlight in the meeting material (and you can also not find it in the overview)? Then it can be because the agenda item that the note, comment, or highlight was set up for is now deleted or has changed position in the agenda after a new republishing/reprocessing.
Contact the agenda producer for the meeting and check if one of the mentioned scenarios can be the reason for the note, comment, or highlight to be deleted: What happens to notes, shared comments, and highlights when republishing a meeting?